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- W2365885710 abstract "This paper aimed to determine the plant community characteristics of Carex moorcroftii steppe embedded in the zonal meadow at different degradation degrees. A field survey was undertaken during 2011 and 2012 to investigate the plant community characteristics at different degradation degrees of C. moorcroftii steppe in the interior of Qinghai-Tibetan Plateau. Sixteen 10 m × 10 m plots were designed at each degradation degree, each plot consisted of four subplots of 1 m × 1 m. In each subplot, all plant species present were identified and recorded for cover and height. The biomass was measured for four economic values of plants(Cyperaceae, Gramineae, Leguminose, Forbs) then harvested and dried. The α diversity of the plant communities was calculated by using the Shannon Wiener index(H), the Pielou index(J), richness index(S), and the β diversity was estimated by Whittacker index(βws). The relationships between height, coverage, species diversity, and the productivity of each economic value of plants and total productivity were analyzed at each degradation degree and degradation system. C. moorcroftii was found to be the dominant plant in the non-degraded C. moorcroftii steppe, replaced by the coexistence of Kobresia pygmaea and C. moorcroftii in the lightly and moderately degraded ones, with no obvious dominant plants identified in highly degraded steppe. With degradation of C. moorcroftii steppe, the hygrophytes decreased, and the mesophytes and xerophytes increased. The richness index and diversity index firstly increased and then decreased with the degradation of C. moorcroftii steppe, peaking at the moderately degraded degree, where legumes with good quality were indentified and the β-diversity index was the highest with the biggest replacement rate of species. Although the cover, height and aboveground biomass of plant community decreased, the aboveground biomass of Gramineae and Leguminose plants firstly increased and then decreased in the degradation process of C. moorcroftii steppe, peaking at the moderately degraded degree. Correlation analysis showed that the relationships between height, cover, evenness index and total productivity were significant positive at different degradation degrees of C. moorcroftii steppe in the interior of Qinghai-Tibetan Plateau. The plant community composition is an important indicator to be included in the process of revealing the mechanism of regressive succession of C. moorcroftii steppe." @default.
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- W2365885710 date "2014-01-01" @default.
- W2365885710 modified "2023-09-22" @default.
- W2365885710 title "Plant community features of Carex moorcroftii steppe at different degradation degrees in the interior of Qinghai-Tibetan Plateau" @default.
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